

4.00" - 5.00" X 4.00" LENGTH REDUCER
🔥 4.00" to 5.00" Silicone Reducer Boot – 4.00" Long, 5-Ply Reinforced for High-Boost Diesel Applications
This 4.00" ID to 5.00" ID high-temperature silicone reducer boot is built to handle the extreme demands of high-boost diesel and performance engine systems. With a durable 5-ply reinforced construction and a 4.00" overall length, it delivers exceptional strength, flexibility, and leak-free performance for custom charge-air, intercooler, and intake piping setups.
Designed to withstand high pressure, vibration, and elevated engine bay temperatures, this reducer boot is perfect for compound turbo configurations and custom fabrication projects.
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🔧 Key Features:
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Inner Diameter: 4.00" to 5.00"
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Length: 4.00"
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5-ply reinforced silicone construction for superior strength and heat resistance
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Strength-tested to handle diesel boost pressures
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Ideal for adapting large-diameter piping in intercooler or turbo systems
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Flexible and durable under extreme heat and vibration
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Smooth inner walls for optimal airflow and easy installation
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📦 What’s Included:
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1x 4.00" to 5.00" x 4.00" High-Temp Silicone Reducer Boot (Black)
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Built to perform under pressure, this high-strength reducer boot ensures a secure, reliable seal in even the most demanding turbocharged diesel and performance applications.
Pairs well with
Ships within 1-2 business days.
Free shipping & returns

4.00" - 5.00" X 4.00" LENGTH REDUCER
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FAQs
Please read our FAQs page to find out more.
Are OEM products more expensive than aftermarket alternatives?
OEM products might have a higher upfront cost compared to aftermarket parts, but their superior quality and durability often make them a more cost-effective choice over time. Investing in OEM ensures you’re getting parts specifically designed for your vehicle, which can lead to better performance and longevity.
Can I purchase OEM parts online or do I need to visit a dealership?
You don’t need to visit a dealership to get OEM parts. You can conveniently purchase genuine OEM components from authorized distributors and reputable online retailers like Turbo Tech Performance. Our online store provides a wide selection of high-quality parts delivered straight to your door.
Are parts from brands like Mopar, ACDelco, and Motorcraft interchangeable between different vehicle brands?
No, parts from Mopar, ACDelco, and Motorcraft are typically designed for specific vehicle brands. It’s crucial to ensure compatibility with your vehicle’s make and model by checking part numbers and consulting with a knowledgeable expert.
Can I install OEM parts myself, or is it better to have a professional handle it?
While some OEM parts can be installed by DIY enthusiasts, the complexity of installation can vary. For the best results and to ensure proper fitment and performance, we recommend having a trained mechanic install the parts, especially if you’re unfamiliar with automotive repairs.
Do OEM parts come with a warranty?
Yes, many OEM auto parts come with a manufacturer’s warranty that covers defects or issues. Be sure to check the warranty details for each part at the time of purchase, and keep your receipt for any potential warranty claims.